package org.apache.maven.model.profile;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.File;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 * Describes the environmental context used to determine the activation status of profiles.
 *
 * @author Benjamin Bentmann
 */
public class DefaultProfileActivationContext implements ProfileActivationContext {

  private List<String> activeProfileIds = Collections.emptyList();

  private List<String> inactiveProfileIds = Collections.emptyList();

  private Map<String, String> systemProperties = Collections.emptyMap();

  private Map<String, String> userProperties = Collections.emptyMap();

  private Map<String, String> projectProperties = Collections.emptyMap();

  private File projectDirectory;

  public List<String> getActiveProfileIds() {
    return activeProfileIds;
  }

  /**
   * Sets the identifiers of those profiles that should be activated by explicit demand.
   *
   * @param activeProfileIds The identifiers of those profiles to activate, may be {@code null}.
   * @return This context, never {@code null}.
   */
  public DefaultProfileActivationContext setActiveProfileIds(List<String> activeProfileIds) {
    if (activeProfileIds != null) {
      this.activeProfileIds = Collections.unmodifiableList(activeProfileIds);
    } else {
      this.activeProfileIds = Collections.emptyList();
    }

    return this;
  }

  public List<String> getInactiveProfileIds() {
    return inactiveProfileIds;
  }

  /**
   * Sets the identifiers of those profiles that should be deactivated by explicit demand.
   *
   * @param inactiveProfileIds The identifiers of those profiles to deactivate, may be {@code null}.
   * @return This context, never {@code null}.
   */
  public DefaultProfileActivationContext setInactiveProfileIds(List<String> inactiveProfileIds) {
    if (inactiveProfileIds != null) {
      this.inactiveProfileIds = Collections.unmodifiableList(inactiveProfileIds);
    } else {
      this.inactiveProfileIds = Collections.emptyList();
    }

    return this;
  }

  public Map<String, String> getSystemProperties() {
    return systemProperties;
  }

  /**
   * Sets the system properties to use for interpolation and profile activation. The system
   * properties are collected from the runtime environment like {@link System#getProperties()} and
   * environment variables.
   *
   * @param systemProperties The system properties, may be {@code null}.
   * @return This context, never {@code null}.
   */
  @SuppressWarnings("unchecked")
  public DefaultProfileActivationContext setSystemProperties(Properties systemProperties) {
    if (systemProperties != null) {
      this.systemProperties = Collections.unmodifiableMap((Map) systemProperties);
    } else {
      this.systemProperties = Collections.emptyMap();
    }

    return this;
  }

  /**
   * Sets the system properties to use for interpolation and profile activation. The system
   * properties are collected from the runtime environment like {@link System#getProperties()} and
   * environment variables.
   *
   * @param systemProperties The system properties, may be {@code null}.
   * @return This context, never {@code null}.
   */
  public DefaultProfileActivationContext setSystemProperties(Map<String, String> systemProperties) {
    if (systemProperties != null) {
      this.systemProperties = Collections.unmodifiableMap(systemProperties);
    } else {
      this.systemProperties = Collections.emptyMap();
    }

    return this;
  }

  public Map<String, String> getUserProperties() {
    return userProperties;
  }

  /**
   * Sets the user properties to use for interpolation and profile activation. The user properties
   * have been configured directly by the user on his discretion, e.g. via the {@code -Dkey=value}
   * parameter on the command line.
   *
   * @param userProperties The user properties, may be {@code null}.
   * @return This context, never {@code null}.
   */
  @SuppressWarnings("unchecked")
  public DefaultProfileActivationContext setUserProperties(Properties userProperties) {
    if (userProperties != null) {
      this.userProperties = Collections.unmodifiableMap((Map) userProperties);
    } else {
      this.userProperties = Collections.emptyMap();
    }

    return this;
  }

  /**
   * Sets the user properties to use for interpolation and profile activation. The user properties
   * have been configured directly by the user on his discretion, e.g. via the {@code -Dkey=value}
   * parameter on the command line.
   *
   * @param userProperties The user properties, may be {@code null}.
   * @return This context, never {@code null}.
   */
  public DefaultProfileActivationContext setUserProperties(Map<String, String> userProperties) {
    if (userProperties != null) {
      this.userProperties = Collections.unmodifiableMap(userProperties);
    } else {
      this.userProperties = Collections.emptyMap();
    }

    return this;
  }

  public File getProjectDirectory() {
    return projectDirectory;
  }

  /**
   * Sets the base directory of the current project.
   *
   * @param projectDirectory The base directory of the current project, may be {@code null} if
   *        profile activation happens in the context of metadata retrieval rather than project
   *        building.
   * @return This context, never {@code null}.
   */
  public DefaultProfileActivationContext setProjectDirectory(File projectDirectory) {
    this.projectDirectory = projectDirectory;

    return this;
  }

  public Map<String, String> getProjectProperties() {
    return projectProperties;
  }

  public DefaultProfileActivationContext setProjectProperties(Properties projectProperties) {
    if (projectProperties != null) {

      this.projectProperties = Collections.unmodifiableMap(toMap(projectProperties));
    } else {
      this.projectProperties = Collections.emptyMap();
    }

    return this;
  }

  private Map<String, String> toMap(Properties properties) {
    if (properties == null) {
      return Collections.emptyMap();
    }
    Map<String, String> map = new HashMap<String, String>();
    Enumeration keys = properties.keys();
    while (keys.hasMoreElements()) {
      String key = (String) keys.nextElement();
      map.put(key, properties.getProperty(key));
    }
    return map;
  }
}
